<template>
    <div id="tags-view-container" class="tags-view-container">
        <scroll-pane ref="scrollPane" class="tags-view-wrapper">
            <router-link
                    v-for="tag in visitedViews"
                    ref="tag"
                    :key="tag.path"
                    :class="isActive(tag)?'active':''"
                    :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
                    tag="span"
                    class="tags-view-item"
                    @click.middle.native="closeSelectedTag(tag)"
                    @contextmenu.prevent.native="openMenu(tag,$event)"
            >
                {{ tag.title }}
                <span v-if="!tag.meta.affix" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)"/>
            </router-link>
        </scroll-pane>
        <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
            <li @click="refreshSelectedTag(selectedTag)">刷新页面</li>
            <li v-if="!(selectedTag.meta&&selectedTag.meta.affix)" @click="closeSelectedTag(selectedTag)">关闭当前</li>
            <li @click="closeOthersTags">关闭其他</li>
            <li @click="closeAllTags(selectedTag)">关闭所有</li>
        </ul>
    </div>
</template>
<script lang="ts">
    import ScrollPane from "./ScrollPane.vue";
    import {Component, Provide, Vue, Watch} from "vue-property-decorator";
    import path from "path";
    import {Getter} from "vuex-class";

    @Component({components: {ScrollPane}})
    export default class TagsView extends Vue {
        @Provide() private visible: boolean = false;
        @Provide() private top: number = 0;
        @Provide() private left: number = 0;
        @Provide() private selectedTag: any = {};
        @Provide() private affixTags: Array<any> = [];
        @Getter("visitedViews") private visitedViews!: any;
        @Getter("routers") private routers!: any;

        @Watch("$route")
        onRouteChanged() {
            this.addTags();
            this.moveToCurrentTag();
        }

        @Watch("visible")
        onVisibleChanged(value: any) {
            if (value) {
                document.body.addEventListener("click", this.closeMenu, {passive: false});
            } else {
                document.body.removeEventListener("click", this.closeMenu);
            }
        }

        mounted() {
            this.initTags();
            this.addTags();
        }


        isActive(route: any) {
            return route.path === this.$route.path;
        }

        filterAffixTags(routes: any, basePath = "/") {
            let tags: any = [];
            routes.forEach((route: any) => {
                if (route.meta && route.meta.affix) {
                    const tagPath = path.resolve(basePath, route.path);
                    tags.push({
                        fullPath: tagPath,
                        path: tagPath,
                        name: route.name,
                        meta: {...route.meta}
                    });
                }
                if (route.children) {
                    const tempTags = this.filterAffixTags(route.children, route.path);
                    if (tempTags.length >= 1) {
                        tags = [...tags, ...tempTags];
                    }
                }
            });
            return tags;
        }

        initTags() {
            const affixTags = this.affixTags = this.filterAffixTags(this.routers);
            for (const tag of affixTags) {
                // Must have tag name
                if (tag.name) {
                    this.$store.dispatch("addVisitedView", tag).catch(reason => console.log(reason));
                }
            }
        }

        addTags() {
            const {name} = this.$route;
            if (name) {
                this.$store.dispatch("addView", this.$route).catch(reason => console.log(reason));
            }
            return false;
        }


        moveToCurrentTag() {
            const tags: any = this.$refs.tag;
            this.$nextTick(() => {
                for (const tag of tags) {
                    if (tag.to.path === this.$route.path) {
                        (this as any).$refs.scrollPane.moveToTarget(tag);
                        // when query is different then update
                        if (tag.to.fullPath !== this.$route.fullPath) {
                            this.$store.dispatch("updateVisitedView", this.$route).catch(reason => console.log(reason));
                        }
                        break;
                    }
                }
            });
        }


        refreshSelectedTag(view: any) {
            this.$store.dispatch("delCachedView", view).then(() => {
                const {fullPath} = view;
                this.$nextTick(() => {
                    this.$router.replace({
                        path: "/redirect" + fullPath
                    }).catch(reason => console.log(reason));
                });
            });
        }


        closeSelectedTag(view: any) {
            this.$store.dispatch("delView", view).then(({visitedViews}) => {
                if (this.isActive(view)) {
                    this.toLastView(visitedViews, view);
                }
            }).catch((e) => {
                console.log(e);
            });
        }


        closeOthersTags() {
            this.$router.push(this.selectedTag).catch(reason => console.log(reason));
            this.$store.dispatch("delOthersViews", this.selectedTag).then(() => {
                this.moveToCurrentTag();
            }).catch((e) => {
                console.log(e);
            });
        }


        closeAllTags(view: any) {
            this.$store.dispatch("delAllViews").then(({visitedViews}) => {
                // if (this.affixTags.some(tag => tag.path === view.path)) {
                //     return;
                // }
                this.toLastView(visitedViews, view);
            }).catch((e) => {
                console.log(e);
            });
        }


        toLastView(visitedViews: any, view: any) {
            const latestView = visitedViews.slice(-1)[0];
            if (latestView) {
                this.$router.push(latestView).catch((e) => {
                    console.log(e);
                });
            } else {
                // now the default is to redirect to the home page if there is no tags-view,
                // you can adjust it according to your needs.
                if (view.name === "Dashboard") {
                    // to reload home page
                    this.$router.replace({path: "/redirect" + view.fullPath}).catch(reason => console.log(reason));
                } else {
                    this.$router.push("/").catch(reason => console.log(reason));
                }
            }
        }


        openMenu(tag: any, e: any) {
            const menuMinWidth = 105;
            const offsetLeft = this.$el.getBoundingClientRect().left;// container margin left
            const offsetWidth = (this as any).$el.offsetWidth; // container width
            const maxLeft = offsetWidth - menuMinWidth + offsetLeft; // left boundary
            const left = e.clientX + 15; // 15: margin right

            if (left > maxLeft) {
                this.left = maxLeft;
            } else {
                this.left = left;
            }

            this.top = e.clientY + 10;
            this.visible = true;
            this.selectedTag = tag;
        }

        closeMenu() {
            this.visible = false;
        }
    }
</script>

<style scoped lang="scss">
    .tags-view-container {
        height: 34px;
        width: 100%;
        background: #fff;
        border-bottom: 1px solid #d8dce5;
        box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);

        .tags-view-wrapper {
            .tags-view-item {
                display: inline-block;
                position: relative;
                cursor: pointer;
                height: 26px;
                line-height: 26px;
                border: 1px solid #d8dce5;
                color: #495060;
                background: #fff;
                padding: 0 8px;
                font-size: 12px;
                margin-left: 5px;
                margin-top: 4px;

                &:first-of-type {
                    margin-left: 15px;
                }

                &:last-of-type {
                    margin-right: 15px;
                }

                &.active {
                    background-color: #42b983;
                    color: #fff;
                    border-color: #42b983;

                    &::before {
                        content: '';
                        background: #fff;
                        display: inline-block;
                        width: 8px;
                        height: 8px;
                        border-radius: 50%;
                        position: relative;
                        margin-right: 2px;
                    }
                }
            }
        }

        .contextmenu {
            margin: 0;
            background: #fff;
            z-index: 3000;
            position: absolute;
            list-style-type: none;
            padding: 5px 0;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 400;
            color: #333;
            box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);

            li {
                margin: 0;
                padding: 7px 16px;
                cursor: pointer;

                &:hover {
                    background: #eee;
                }
            }
        }
    }
</style>

